I\'ve seen your stuff, you don\'t want to preserve it. LOL
I\'m just kidding, I didn\'t look at your stuff.
Anyway, all pigments fade to varying degrees. You\'d have to speak with the manufacturer of the paint to find out if the paint is colourfast. I\'ve heard vallejo model colour isn\'t the most colourfast. Then again, it was formulated for models, not wargamers.
I\'d keep miniatures out of sunny areas and consider investing in display boxes to keep the dust off, instead of just on a bare shelf.